var saveAs =
  saveAs ||
  (function(view) {
    "use strict";
    // IE <10 is explicitly unsupported
    if (
      typeof view === "undefined" ||
      (typeof navigator !== "undefined" &&
        /MSIE [1-9]\./.test(navigator.userAgent))
    ) {
      return;
    }
    var doc = view.document,
      // only get URL when necessary in case Blob.js hasn't overridden it yet
      get_URL = function() {
        return view.URL || view.webkitURL || view;
      },
      save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a"),
      can_use_save_link = "download" in save_link,
      click = function(node) {
        var event = new MouseEvent("click");
        node.dispatchEvent(event);
      },
      is_safari = /constructor/i.test(view.HTMLElement),
      is_chrome_ios = /CriOS\/[\d]+/.test(navigator.userAgent),
      throw_outside = function(ex) {
        (view.setImmediate || view.setTimeout)(function() {
          throw ex;
        }, 0);
      },
      force_saveable_type = "application/octet-stream",
      // the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
      arbitrary_revoke_timeout = 1000 * 40, // in ms
      revoke = function(file) {
        var revoker = function() {
          if (typeof file === "string") {
            // file is an object URL
            get_URL().revokeObjectURL(file);
          } else {
            // file is a File
            file.remove();
          }
        };
        setTimeout(revoker, arbitrary_revoke_timeout);
      },
      dispatch = function(filesaver, event_types, event) {
        event_types = [].concat(event_types);
        var i = event_types.length;
        while (i--) {
          var listener = filesaver["on" + event_types[i]];
          if (typeof listener === "function") {
            try {
              listener.call(filesaver, event || filesaver);
            } catch (ex) {
              throw_outside(ex);
            }
          }
        }
      },
      auto_bom = function(blob) {
        // prepend BOM for UTF-8 XML and text/* types (including HTML)
        // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
        if (
          /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(
            blob.type
          )
        ) {
          return new Blob([String.fromCharCode(0xfeff), blob], {
            type: blob.type
          });
        }
        return blob;
      },
      FileSaver = function(blob, name, no_auto_bom) {
        if (!no_auto_bom) {
          blob = auto_bom(blob);
        }
        // First try a.download, then web filesystem, then object URLs
        var filesaver = this,
          type = blob.type,
          force = type === force_saveable_type,
          object_url,
          dispatch_all = function() {
            dispatch(
              filesaver,
              "writestart progress write writeend".split(" ")
            );
          },
          // on any filesys errors revert to saving with object URLs
          fs_error = function() {
            if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {
              // Safari doesn't allow downloading of blob urls
              var reader = new FileReader();
              reader.onloadend = function() {
                var url = is_chrome_ios
                  ? reader.result
                  : reader.result.replace(
                      /^data:[^;]*;/,
                      "data:attachment/file;"
                    );
                var popup = view.open(url, "_blank");
                if (!popup) view.location.href = url;
                url = undefined; // release reference before dispatching
                filesaver.readyState = filesaver.DONE;
                dispatch_all();
              };
              reader.readAsDataURL(blob);
              filesaver.readyState = filesaver.INIT;
              return;
            }
            // don't create more object URLs than needed
            if (!object_url) {
              object_url = get_URL().createObjectURL(blob);
            }
            if (force) {
              view.location.href = object_url;
            } else {
              var opened = view.open(object_url, "_blank");
              if (!opened) {
                // Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
                view.location.href = object_url;
              }
            }
            filesaver.readyState = filesaver.DONE;
            dispatch_all();
            revoke(object_url);
          };
        filesaver.readyState = filesaver.INIT;

        if (can_use_save_link) {
          object_url = get_URL().createObjectURL(blob);
          setTimeout(function() {
            save_link.href = object_url;
            save_link.download = name;
            click(save_link);
            dispatch_all();
            revoke(object_url);
            filesaver.readyState = filesaver.DONE;
          });
          return;
        }

        fs_error();
      },
      FS_proto = FileSaver.prototype,
      saveAs = function(blob, name, no_auto_bom) {
        return new FileSaver(
          blob,
          name || blob.name || "download",
          no_auto_bom
        );
      };
    // IE 10+ (native saveAs)
    if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
      return function(blob, name, no_auto_bom) {
        name = name || blob.name || "download";

        if (!no_auto_bom) {
          blob = auto_bom(blob);
        }
        return navigator.msSaveOrOpenBlob(blob, name);
      };
    }

    FS_proto.abort = function() {};
    FS_proto.readyState = FS_proto.INIT = 0;
    FS_proto.WRITING = 1;
    FS_proto.DONE = 2;

    FS_proto.error = FS_proto.onwritestart = FS_proto.onprogress = FS_proto.onwrite = FS_proto.onabort = FS_proto.onerror = FS_proto.onwriteend = null;

    return saveAs;
  })(
    (typeof self !== "undefined" && self) ||
      (typeof window !== "undefined" && window) ||
      this.content
  );
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window

if (typeof module !== "undefined" && module.exports) {
  module.exports.saveAs = saveAs;
} else if (
  typeof define !== "undefined" &&
  define !== null &&
  define.amd !== null
) {
  define([], function() {
    return saveAs;
  });
}
